Father size 40, number 25, mother size 38, number 24, Xiaoli size 35, number 22 and 1 / 2, write the transformation relationship between the number x and size m of shoes

Father size 40, number 25, mother size 38, number 24, Xiaoli size 35, number 22 and 1 / 2, write the transformation relationship between the number x and size m of shoes

X=M/2+5

[mathematics, function] there is a conversion relationship between shoe size and shoe length (CM). The following table is the corresponding list of several groups of shoe size and shoe length
16 19 21 24 shoe size 22 28 32 38
(1) Let the length of the shoe be x and the size of the shoe be y. try to judge (x, y) on the image of which function you have learned?
(2) Finding the functional relation between X and Y

1-degree function
2. Let y = KX + B
Bring (16,22) (19,28) in
22=16k+b①
28=19k+b②
②-①
6=3k
k=2
Substituting k = 2 into 1
b=-10
The formula is y = 2x-10
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